Agenda
Signal Processing Seminar
- Wednesday, 20 November 2019
- 10:00-11:00
- HB 17.150
On Unlimited Sampling and Reconstruction: A New Way to Sense the Continuum
Ayush BhandariAlmost all forms of data are captured using digital sensors or analog-to-digital converters (ADCs) which are inherently limited by dynamic range. Consequently, whenever a physical signal exceeds the maximum recordable voltage, the digital sensor saturates and results in clipped measurements. For example, a camera pointed towards the sun leads to an all-white photograph. Motivated by a variety of applications including scientific imaging, communication theory and digital sensing, a natural question that arises is: Can we capture a signal with arbitrary dynamic range?
In this work, we introduce the Unlimited Sensing framework which is a novel, non-linear sensing architecture that allows for recovery of an arbitrarily high dynamic range, continuous-time signal from its low dynamic range, digital measurements. Our work is based on a radically different ADC design, which allows for the ADC to reset rather than to saturate, thus producing modulo or folded samples.
In the first part of this talk, we discuss a recovery guarantee akin to Shannon’s sampling theorem which, remarkably, is independent of the maximum recordable ADC voltage. Our theory is complemented with a stable recovery algorithm. Moving further, we reinterpret the unlimited sensing framework as a generalized linear model and discuss the recovery of structured signals such as continuous-time sparse signals. This new sensing paradigm that is based on a co-design of hardware and algorithms leads to several interesting future research directions. On the theoretical front, a fundamental interplay of sampling theory and inverse problems raises new standalone questions. On the practical front, the benefits of a new way to sense the world (without dynamic range limitations) are clearly visible. We conclude this talk with a discussion on future directions and relevant applications.
Additional information ...Agenda
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- 11:00
- HB 17.140
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- 10:00
- HB18.090
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- Mon, 6 May 2024
- 12:30
- Aula Senaatszaal
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- Tue, 21 May 2024
- 10:00
- Aula Senaatszaal
PhD Thesis Defence
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- 27 -- 28 May 2024
- Aula, TU Delft
Conferences
44th Benelux Symposium on Information Theory and Signal Processing (SITB'24, Delft)
- Tue, 18 Jun 2024
- 15:00
- Aula Senaatszaal
PhD Thesis Defence
Hanie Moghaddasi
Model-based feature engineering of atrial fibrillation
- Mon, 24 Jun 2024
- Aula, TU Delft